What does Dexter Morgan inject people with in Dexter?

Dexter administers a small dose of Etorphine to his victims as a way of immobilizing them. The sedative works instantly, rendering the injected immobile and unconscious within a couple of seconds and lasting for several hours. He administers the Etorphine via an Hypodermic Needle, typically to the neck of his victims. read more

I googled it up and Dexter Wikia says Etorphine. Etorphine is often used to immobilize elephants and other large mammals. Etorphine is available legally only for veterinary medicine|veterinary use and is strictly governed by law. Dexter administers a small dose of Etorphine to his victims as a way of immobilizing them. read more

Dexter Morgan is a fictional character and the antihero of a series of novels by Jeff Lindsay, including Darkly Dreaming Dexter (2004), Dearly Devoted Dexter (2005), Dexter in the Dark (2007), Dexter by Design (2009), Dexter Is Delicious (2010), Double Dexter (2011), Dexter's Final Cut (2013), and Dexter Is Dead (2015). read more

In Dexter's Final Cut, a famous celebrity becomes obsessed with Dexter Morgan after researching him for his new role. When the Big Ticket Network comes to Miami, Deborah and Dexter are assigned as "technical advisors" to the stars of the show. read more